Function: () notation
The query language takes the standard function notation to define a function by using ‘(' and ‘)'.
In the following examples, 1 is a catalog function; 2 is hierarchy
function; 3 is a date function; and 4 is a path function:
catalog (‘my catalog')
hierarchy (‘my category tree')
date (‘12/12/2004', ‘mm/dd/yyyy')
path (‘c#root#myhome', ‘#')